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Fri, 08 Dec 2017 06:13:00 GMT

在Spring cloud config出来之前, 自己实现了基于ZK的配�|�中�? 杜绝了本地properties配置文�g, 原理很简�? 只是重蝲了PropertyPlaceholderConfigurer的mergeProperties():

/**
 * 重蝲合�ƈ属性实�?br /> * 先加载file properties�Q?然后�q�入ZK配置中心��d��的properties
 *
 * @return 合�ƈ后的属性集�?br /> * @throws IOException 异常
 */
@Override
protected Properties mergeProperties() throws IOException {
    Properties result = new Properties();
    // 加蝲父类的配�|?br />    Properties mergeProperties = super.mergeProperties();
    result.putAll(mergeProperties);
    // 加蝲从zk中读取到的配�|?br />    Map, String> configs = loadZkConfigs();
    result.putAll(configs);
    return result;
}

�q�个实现在spring��目里用��h��q�是挺顺手的, 但是�q�期部分spring-boot��目里发现这�U�placeholder的实现跟spring boot的@ConfigurationProperties(prefix = "xxx") 不能很好的配合工�?
也就是属性没有被resolve处理, 用@Value的方式确可以��d��, 但是@Value配置��h��如果属性多的话�q�是挺繁琐的, �q�是們֐�用@ConfigurationProperties的prefix, 于是看了下spring boot的文��发�?code>PropertySource order:

   * Devtools global settings properties on your home directory (~/.spring-boot-devtools.properties when devtools is active).
   * @TestPropertySource annotations on your tests.
   * @SpringBootTest#properties annotation attribute on your tests.
   * Command line arguments.
   * Properties from SPRING_APPLICATION_JSON (inline JSON embedded in an environment variable or system property)
   * ServletConfig init parameters.
   * ServletContext init parameters.
   * JNDI attributes from java:comp/env.
   * Java System properties (System.getProperties()).
   * OS environment variables.
   * A RandomValuePropertySource that only has properties in random.*.
   * Profile-specific application properties outside of your packaged jar (application-{profile}.properties and YAML variants)
   * Profile-specific application properties packaged inside your jar (application-{profile}.properties and YAML variants)
   * Application properties outside of your packaged jar (application.properties and YAML variants).
   * Application properties packaged inside your jar (application.properties and YAML variants).
   * @PropertySource annotations on your @Configuration classes.
   * Default properties (specified using SpringApplication.setDefaultProperties).

不难发现其会��查Java system propeties里的属�? 也就是说, 只要把mergerProperties��d��的属性写入Java system props里即�? 看了下源�? 扑ֈ�个切入点

/**
 * 重蝲处理属性实�?br /> * �Ҏ��选项, 军_��是否���合�q�后的props写入�pȝ��属�? Spring boot需�?br /> *
 * @param beanFactoryToProcess
 * @param props                合�ƈ后的属�?br /> * @throws BeansException
 */
@Override
protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props) throws BeansException {
    // 原有逻辑
     super.processProperties(beanFactoryToProcess, props);
    // 写入到系�l�属�?br />    if (writePropsToSystem) {
       // write all properties to system for spring boot
        Enumeration propertyNames = props.propertyNames();
        while (propertyNames.hasMoreElements()) {
             String propertyName = (String) propertyNames.nextElement();
             String propertyValue = props.getProperty(propertyName);
             System.setProperty(propertyName, propertyValue);
        }
    }
}

为避免媄响过�? 讄��了个开�? 是否写入�pȝ��属�? 如果是spring boot的项�? ��开�? �q�样对线上非spring boot��目做到影响最��? 然后spring boot的@ConfigurationProperties完美��d��属�?

具体代码�? org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor

@Override
public Object postProcessBeforeInitialization(Object bean, String beanName)
      throws BeansException {
   ConfigurationProperties annotation = AnnotationUtils
         .findAnnotation(bean.getClass(), ConfigurationProperties.class);
   if (annotation != null) {
      postProcessBeforeInitialization(bean, beanName, annotation);
 }
   annotation = this.beans.findFactoryAnnotation(beanName,
 ConfigurationProperties.class);
   if (annotation != null) {
      postProcessBeforeInitialization(bean, beanName, annotation);
 }
   return bean;
}

Milo的�v�?/a> 2017-12-08 14:13 发表评论

Sat, 15 Apr 2017 02:32:00 GMT

Spring默认不允许对�cȝ��变量, 也就是静态变量进行注入操�? 但是在某些场景比如单元测试的@AfterClass要访问注入对�? 而Junit的这个方法必��L��静态的, 也就产生了悖�?

解决思�\有两�?

思�\1: 惛_��法对静态变量注�? 也就是绕�q�Spring只能�q�行非静态变量才能注入依赖的壁垒
思�\2: 惛_��法@AfterClass攚w��ؓ非静�?/span>
- 实现Junit RunListener, 覆盖testRunFinished�Ҏ��, �q�里��d��现类似@AfterClass的功�? �q�个�Ҏ��是非静态的
- 不要用Junit, 改用TestNG, TestNG里的AfterClass是非静态的
- 用Spring的TestExecutionListeners, 实现个Listener, 里面也有个类似非静态的AfterClass的实�? 覆盖实现��p��

思�\2的几个方法都可以实现, 但是单元��试Runner需要用

@RunWith(Theories.class)

而且改用TestNG工程��大, 只能攑ּ�掉这个思�\

�l�箋走思�\1, 只能�ȝ��q�Spring的依赖注入的static壁垒�? 具体代码如下:

 @Autowired
 private Destination dfsOperationQueue;
 private static Destination dfsOperationQueueStatic; // static version
 @Autowired
 private MessageQueueAPI messageQueueAPI;
 private static MessageQueueAPI messageQueueAPIStatic; // static version


 @PostConstruct
 public void init() {
        dfsOperationQueueStatic = this.dfsOperationQueue;
        messageQueueAPIStatic = this.messageQueueAPI;
 }

 @AfterClass
 public static void afterClass() {
        MessageVO messageVO = messageQueueAPIStatic.removeDestination(dfsOperationQueueStatic);
        System.out.println(messageVO);
 }

其实��是用了@PostConstruct 来个��h��换柱而已, 多声明个静态成员指向非静态对�? 两者其实是一个对�?/span>

Milo的�v�?/a> 2017-04-15 10:32 发表评论

通过rest api��理activemq

Sat, 22 Oct 2016 09:31:00 GMT

知道activemq现在已经支持了rest api, 但是官方对这部分的介�l�一�W�带�q?(http://activemq.apache.org/rest.html),

通过google居然也没搜到一些有用的, 比如像删除一个destination, 都是问的�?然后没下�? 于是�׃��一些心思研�I�了一�?

首先通过rest api获取当前版本所有已支持的协�?/p>

http://172.30.43.206:8161/api/jolokia/list

然后�Ҏ��json输出关于removeTopic, removeQueue的mbean实现通过rest api删除destination的方�? 注意到用GET��h��而不是POST,不然会报�?(官网的例子里用的wget�l�的灉|��, 开始用了POST老报�?

import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.DefaultHttpClient;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

import javax.jms.Destination;
import javax.jms.JMSException;
import java.util.Arrays;

public class MessageQueueAdmin {
    private static final RestTemplate restTemplate = getRestTemplate("admin", "admin");

    private static String brokerHost = "172.30.43.206";
    private static String adminConsolePort = "8161";
    private static String protocol = "http";

    public static void removeDestination(Destination destination) throws JMSException {
        String destName, destType;
        if (destination instanceof ActiveMQQueue) {
            destName = ((ActiveMQQueue) destination).getQueueName();
            destType = "Queue";
        } else {
            destName = ((ActiveMQTopic) destination).getTopicName();
            destType = "Topic";
        }

        // build urls
        String url = String.format("%s://%s:%s/api/jolokia/exec/org.apache.activemq:" +
                "brokerName=localhost,type=Broker/remove%s/%s", protocol, brokerHost, adminConsolePort, destType, destName);
        System.out.println(url);
        // do operation
        HttpHeaders headers = new HttpHeaders();
        headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
        HttpEntity<String> entity = new HttpEntity<String>("parameters", headers);
        ResponseEntity response = restTemplate.exchange(url, HttpMethod.GET, entity, String.class);
        System.out.println(response.getBody());
    }

    public static void main(String[] args) throws JMSException {
        ActiveMQTopic topic = new ActiveMQTopic("test-activemq-topic");
        removeDestination(topic);
    }

    private static RestTemplate getRestTemplate(String user, String password) {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(user, password));
        httpClient.setCredentialsProvider(credentialsProvider);
        ClientHttpRequestFactory rf = new HttpComponentsClientHttpRequestFactory(httpClient);

        return new RestTemplate(rf);
    }
}

其他的请�?应该都是�c�M��jolokia的exec get request的格�?

https://jolokia.org/reference/html/protocol.html#exec

/exec/////.

Milo的�v�?/a> 2016-10-22 17:31 发表评论

Wed, 12 Oct 2016 08:32:00 GMT

用Spring JMS 的JmsTemplate从消息队列消�Ҏ��息时发现�Q��用了CLIENT_ACKNOWLEDGE模式�Q�消息返回后��L��自动被ack�Q�也��是被broker "Dequeued"

    protected Message doReceive(Session session, MessageConsumer consumer) throws JMSException {
        try {
            // Use transaction timeout (if available).
            long timeout = getReceiveTimeout();
            JmsResourceHolder resourceHolder =
                    (JmsResourceHolder) TransactionSynchronizationManager.getResource(getConnectionFactory());
            if (resourceHolder != null && resourceHolder.hasTimeout()) {
                timeout = Math.min(timeout, resourceHolder.getTimeToLiveInMillis());
            }
            Message message = doReceive(consumer, timeout);
            if (session.getTransacted()) {
                // Commit necessary - but avoid commit call within a JTA transaction.
                if (isSessionLocallyTransacted(session)) {
                    // Transacted session created by this template -> commit.
                    JmsUtils.commitIfNecessary(session);
                }
            }
            else if (isClientAcknowledge(session)) {
                // Manually acknowledge message, if any.
                if (message != null) {
                    message.acknowledge();
                }
            }
            return message;
        }
        finally {
            JmsUtils.closeMessageConsumer(consumer);
        }
    }

但是使用异步listener ��׃��会出现这个情况，搜了下google�Q�发现果然存在这个问�?br />

     https://jira.spring.io/browse/SPR-12995
     https://jira.spring.io/browse/SPR-13255
     http://louisling.iteye.com/blog/241073

同步方式拉取消息�Q�暂时没扑ֈ�好的��装�Q�只能暂时用�q�。或者尽量用listener, �q�个问题暂时标记下，或者谁有更好的解决�Ҏ��可以comment�?img src ="http://www.tkk7.com/miaoyachun/aggbug/431885.html" width = "1" height = "1" />

Milo的�v�?/a> 2016-10-12 16:32 发表评论

Wed, 15 Jun 2016 01:32:00 GMT

默认的配�|�有时候点不亮昄��器，且分辨率很低�Q�通过tvservice工具不断调试�Q�发��C��面的参数可以完美匚w��?br />修改 /boot/config.txt的下列参�?/div>

disable_overscan=1
hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode=16
hdmi_drive=2
config_hdmi_boost=4
dtparam=audio=on

Milo的�v�?/a> 2016-06-15 09:32 发表评论

Thu, 26 May 2016 06:14:00 GMT

http://stackoverflow.com/questions/3294423/spring-classpath-prefix-difference

SIMPLE DEFINITION

The classpath*:conf/appContext.xml simply means that all appContext.xml files under conf folders in all your jars on the classpath will be picked up and joined into one big application context.

In contrast, classpath:conf/appContext.xml will load only one such file the first one found on your classpath.

<bean id="propertyConfigurer"
 class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
   <property name="locations">
      <list>
         <value>classpath:*.propertiesvalue>
         <value>classpath*:*.propertiesvalue>
      list>
   property>
bean>

Milo的�v�?/a> 2016-05-26 14:14 发表评论

When launched from .exe IDEA looks for Java in a following order

Mon, 16 May 2016 00:49:00 GMT

IDEA_JDK (or IDEA_JDK_64) environment variable
jre/ (or jre64/) directory in IDEA home
registry
JDK_HOME environment variable
JAVA_HOME environment variable

Milo的�v�?/a> 2016-05-16 08:49 发表评论

Thu, 21 Apr 2016 09:06:00 GMT

java里如何修改console的历史输��Z��息呢�Q�如果是当前行的修改可以��单想�?\r"的方案，但是如果要修改上一行呢? google了下原来�q�是有方法的�Q�需要用到ansi的control sequences
ANSI code

用java写了个简单的例子�Q�例子就是把曄��的output修改为其他字�W�串�q�恢复之后的打印�Q�代码里加了sleep�Q�主要方便理解各�U�控制序列的含义

        //print some test messages
        System.out.println("1");
        Thread.sleep(1000);
        System.out.println("22");
        Thread.sleep(1000);
        System.out.println("333");
        Thread.sleep(1000);
        System.out.println("4444");
        Thread.sleep(1000);

        /**
         * modify "333" to "-"
         */
        // Move up two lines
        int count = 2;
        System.out.print(String.format("\033[%dA", count));
        Thread.sleep(1000);
        // Erase current line content
        System.out.print("\033[2K");
        Thread.sleep(1000);
        // update with new content
        System.out.print("-");
        Thread.sleep(1000);
        // Move down two lines
        System.out.print(String.format("\033[%dB", count));
        Thread.sleep(1000);
        // Move cursor to left beginning
        System.out.print(String.format("\033[D", count));
        // continue print others
        Thread.sleep(1000);
        System.out.println("55555");
        Thread.sleep(1000);

Milo的�v�?/a> 2016-04-21 17:06 发表评论

zookeeper学习

Thu, 31 Mar 2016 06:06:00 GMT

1. zookeeper basic/fast paxsos 的�Ş象表�q?https://www.douban.com/note/208430424/
2. 详细介绍 http://blog.csdn.net/xhh198781/article/details/10949697

Milo的�v�?/a> 2016-03-31 14:06 发表评论

Spring boot 开启reponse压羃以及部分参数讄��

Tue, 29 Mar 2016 03:50:00 GMT

server.compression.enabled=true 
server.compression.mime-types=application/json,application/xml,text/html,text/xml,text/plain
server.compression.min-response-size=4096

�W�一个参数打开压羃开养I��W�二个参数添加json reponse�Q�尤其是为rest api�Q?�W�三个参数是�Ҏ��reponse的大��设�|�启用压�~�的最��?默认�?K�Q�自己根据实际情况调�?

参�?div>http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#how-to-enable-http-response-compression

Milo的�v�?/a> 2016-03-29 11:50 发表评论

亚洲AV电影院在线观看,亚洲国产成人久久,亚洲小说区图片区

通过rest api���理activemq

When launched from .exe IDEA looks for Java in a following order

zookeeper学习

Spring boot 开启reponse压羃以及部分参数讄���

通过rest api��理activemq

Spring boot 开启reponse压羃以及部分参数讄��